Huh, I've never seen a digital voucher before. How do they work? And how can the employer detect what the employee uses it for?
I guess the net result is the same? It seems accepting the digital voucher comes with a huge risk--what if they decide to object to the establishment or your food choice? So just.. bring a sandwich for lunch instead or pay with your own money...
EDIT: the important thing to remember as a U.S. employee is that--just like every interaction with the police is grounds for arrest--every interaction with your employer is grounds for dismissal. So minimize those interactions.
ANOTHER EDIT: which restaurants or food trucks accept these "digital vouchers"? Are these some kind of apple wallet type thing on your phone? So it only works at places with certain payment equipment? Many places I like to eat only take cash..